Method and system of interference cancelation in collocated transceivers configurations

Abstract

The present invention, in some embodiments thereof, relates to a method of cancelling interference in a wireless system, wherein the interference introduced by an interfering signal causing reception of an interfered signal responsive to transmission of a desired signal, the method comprising acquiring the interfering signal from a transmitter during or before transmission thereof, generating an analog cancellation signal based on the acquired interfering signal, and injecting said analog cancellation signal into an interfered receiver receiving said interfered signal to reduce said interference therefrom.

What is claimed is: 
     
       1. A method of cancelling interference in a wireless system, said interference introduced by an interfering signal causing reception of an interfered signal responsive to transmission of a desired signal, comprising:
 acquiring said interfering signal from a transmitter during or before transmission thereof in time or frequency domain; 
 estimating a reception interference based on al least one previously received interfered signal by utilizing an adaptive filter configured to generate a plurality of coefficients based on at least one previously received interfered signal to which a cancellation signal been injected or summated, where said plurality of coefficients are used for generating the cancellation signal; 
 generating an analog cancellation signal based on said acquired interfering signal in time or frequency domain and said reception interference; and 
 injecting said analog cancellation signal into an interfered receiver receiving said interfered signal to reduce said interference therefrom. 
 
     
     
       2. A method according to  claim 1 , wherein the injecting employs a transmitter, said transmitter being part of a transceiver comprising the interfered receiver. 
     
     
       3. A method according to  claim 1 , wherein the interfered signal is received by a receiving antenna located adjacent to a transmitting antenna from which the interfering signal is transmitted. 
     
     
       4. A method according to  claim 1 , wherein the at least one previously received interfered signal comprises at least one previously received interfered signal to which a cancellation signal been injected or summated. 
     
     
       5. A method according to  claim 1 , further comprising transmitting the interfering signal using a set of antennas configured to steer null or select a beam minimizing interference toward the antenna of the interfered receiver. 
     
     
       6. A method according to  claim 1 , further comprising receiving the interfered signal using a set of antennas configured to steer null towards the antenna of the interfering transmitter or select a beam minimizing interference from the antenna of the Interfering transmitter. 
     
     
       7. A multiple input multiple output antennas configuration comprising a plurality of interfered receivers each adapted to perform the interference cancelling according to  claim 1 . 
     
     
       8. A method according to  claim 1 , used to provide reduced degree of freedom for beamformer weights setting. 
     
     
       9. A method according to  claim 1 , wherein the adaptive filter is a finite impulse response filter or a frequency domain filter. 
     
     
       10. A method according to  claim 1 , wherein the estimating comprises frequency domain wide-band acquisition and tracking. 
     
     
       11. A method of cancelling interference introduced in a wireless system into a desired signal transmitted from a primary antenna of a primary transmitter, said interference introduced by an interfering signal transmitted from a secondary antenna of a secondary transmitter, said primary and secondary antennas being adjacently located directional antennas with partially overlapping transmitter antenna patterns, comprising:
 acquiring said interfering signal before or during transmission thereof; 
 estimating reception interference based on said acquired interfering signal; 
 generating a cancellation signal based on said estimating and said acquired interfering signal; and 
 injecting said cancellation signal into said primary transmitter for reducing interference related to said interfering signal at a primary receiver receiving a composite signal comprising said desired signal and said interference. 
 
     
     
       12. A method according to  claim 11 , wherein the injecting is into an analog or digital transmission path of the primary transmitter. 
     
     
       13. A method according to  claim 11 , further comprising a reciprocal cancellation performed for cancelling in the secondary transmitter interference introduced by an interfering signal transmitted from the primary antenna of the primary transmitter. 
     
     
       14. A method according to  claim 11 , wherein the estimating is carried out in a remote receiver receiving the interfering signal and configured to provide a plurality of coefficients based on at least one previously received interfered signal, further comprising transmitting said coefficients to the primary transmitter for generating the cancellation signal. 
     
     
       15. A method according to  claim 11 , wherein the primary and secondary transmitters or receivers are respective parts of primary and secondary hub transceivers in a hub and spoke communication network. 
     
     
       16. A method according to  claim 11 , wherein the estimating comprises frequency domain wide-band acquisition and tracking. 
     
     
       17. A method of cancelling interference introduced in a wireless system into a desired signal transmitted to a primary antenna of a primary receiver, said interference introduced by an interfering signal transmitted to a secondary antenna of a secondary receiver, said primary and secondary antennas being adjacently located directional antennas with partially overlapping receiver antenna patterns, said primary receiver receives a composite signal comprising said desired signal and said interference, the method comprising:
 acquiring said interfering signal as received through said secondary antenna; 
 estimating reception interference of said interfering signal based on said acquired interfering signal; 
 generating a cancellation signal based on said estimating and said acquired interfering signal; and 
 summating in said primary receiver said composite signal and said cancellation signal to reduce said interference. 
 
     
     
       18. A method according to  claim 17 , further comprising a reciprocal cancellation performed for cancelling in the secondary receiver interference introduced by an interfering signal received by the primary antenna of the primary receiver. 
     
     
       19. A method according to  claim 17 , wherein the estimating comprises frequency domain wide-band acquisition and tracking. 
     
     
       20. A method of cancelling interference introduced in a wireless system into a desired signal transmitted to a primary antenna of a primary receiver, said interference introduced by an interfering signal transmitted to a secondary antenna of a secondary receiver, said primary and secondary antennas being adjacently located, said primary receiver receives a composite signal comprising said desired signal and said interference, the method comprising:
 acquiring said interfering signal as received through said secondary antenna; 
 estimating reception interference of said interfering signal based on said acquired interfering signal, by temporarily muting the primary transmitter or by transmission of a pre-known interfering signal to the secondary receiver; 
 generating a cancellation signal based on said estimating and said acquired interfering signal; and 
 summating in said primary receiver said composite signal and said cancellation signal to reduce said interference. 
 
     
     
       21. A system according to  claim 20  comprised of a plurality transceivers using directional antennas with mutual partial overlapping radiation pattern antennas arranged as hub and spoke topology for backhaul application, each transceiver comprising a cross-lobe cancellation mechanism fed by overlapping transceivers. 
     
     
       22. A method of cancelling interference in a wireless system, said interference introduced by an interfering signal causing reception of an interfered signal responsive to transmission of a desired signal, comprising:
 acquiring said interfering signal from a transmitter during or before transmission thereof in time or frequency domain; 
 generating an analog cancellation signal based on said acquired interfering signal in time or frequency domain; 
 injecting said analog cancellation signal into an interfered receiver receiving said interfered signal to reduce said interference therefrom; and 
 
       adjusting power of a transmitter from which the interfering signal is transmitted to a maximal value causing limited interference or degradation in the receiver if after the result of the injecting or summating residual error in the obtained signal is still high.